常规可控震源都是采用瞬时频率随时间线性变化的扫描信号。
All the conventional vibrators use the sweep signal of which the instantaneous frequency shows linear change with time.
介绍了利用直接数字合成技术产生频率扫描信号的新方法。
A novel method of direct digital synthesizing frequency sweep signal is presented.
扫描采样率对成像质量至关重要，可通过驱动信号的频率选择和图像采集时间的设定来控制。
The scanning sampling density crucial to imaging quality can be deliberately controlled by setting of the driving frequencies as well as fetching duration.
为提高扫描过程中频率的精度和准确度需要选择合适的扫描信号和检测方法。
We should choose the suitable sweep signal and good test method to improve the precision and accuracy of frequency.
扫描探针显微镜- d21提供自动频率，相位和电压匹配使用模拟或离散输出信号。
The SPM-D21 provides automatic frequency, phase and voltage matching using either analog or discrete output signals.
CLK采用频率可调信号发生器，逐渐改变频率，观察扫描频率的改变对输出效果的影响。
CLK signal generator with adjustable frequency, gradually changing the frequency of observed changes in scan frequency effect on the output.
扫描 探针 显微镜 -d10yb同步器，提供自动频率和电压匹配使用离散输出偏置信号。
The SPM-D10YB synchronizer provides automatic frequency and voltage matching using discrete output bias signals.
该序列通过数-模转换器和低通滤波器后，产生出频率扫描信号。
After the sequence passes through digital-to-analog converter and low pass filter, the desired frequency sweep signal is synthesized by the method of direct digital synthesis.
锁定：扫描将停在发现的一个信号频率上，不再继续扫描操作。
HOLD: The scanner will stop when a signal is received, and will not restart.
被合成的频率扫描信号的起始频率、终止频率和扫描时间可根据需要随意设定，并且可以实现对三者的精确控制。
Start frequency, stop frequency and sweep time of the signal synthesized by the method can be preset freely and controlled accurately.
被合成的频率扫描信号的起始频率、终止频率和扫描时间可根据需要随意设定，并且可以实现对三者的精确控制。
Start frequency, stop frequency and sweep time of the signal synthesized by the method can be preset freely and controlled accurately.
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